Difference: LHCbTheoryRareDecays (1 vs. 5)

Revision 52012-03-05 - ThomasBlake

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META TOPICPARENT name="LHCbNovember2011TheoryWorkshop"

Session on LFV and rare D and B decays

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    • B-->
4mu is experimentaly rather background free. Can it be used to constrain NP (e.g., look for Z' w/o contradicting Bs mixing, look for new scalars ...)
  • Can be this (or other channel) be related to HyperCP Sigma ->p mumu (H.Park et al. (HyperCP Coll.) PRL 94, 021801 (2005))
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    April 16th - 18th Session organisation for Rare Decays

    April 16th and 17th 11:15-13:00

    session1.png

    April 18th 09:00-10:45

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    Revision 42011-10-31 - DiegoMartinezSantos

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    META TOPICPARENT name="LHCbNovember2011TheoryWorkshop"

    Session on LFV and rare D and B decays

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      • Given existing results on mu -> e gamma and mu -> 3 e, what are the prospects for tau -> 3 mu?
      • What are the most promising decays to search for lepton flavour violation that can be measured in LHCb (which could include final states with electrons, muons, taus or charged hadrons, e.g. B -> e mu)?
      • What are the correlations with other non-lepton flavour violating observables (e.g. Bs -> mu mu)?
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    • B-->
    4mu, other decays
    • B-->4mu is experimentaly rather background free. Can it be used to constrain NP (e.g., look for Z' w/o contradicting Bs mixing, look for new scalars ...)
    • Can be this (or other channel) be related to HyperCP Sigma ->p mumu (H.Park et al. (HyperCP Coll.) PRL 94, 021801 (2005))
      -- ThomasBlake - 10-Oct-2011

    Revision 32011-10-27 - JohannesAlbrecht

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    META TOPICPARENT name="LHCbNovember2011TheoryWorkshop"

    Session on LFV and rare D and B decays

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      List of questions:
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    • SM calculation of BR(Bs-->
    mumu): Summarize hte SM calculation with the different approaches. Is there a preferred calculation and where is it published?
    ex1
    A. Buras et al, arXiv:1007.5291: BR=(3.2+-0.2) x 10-9 and ex2: M. Bona et al. (UTFit Coll): BR= (3.7+-0.5)x10-9 Phys.Lett.B687 (2010) 61. at least in 1), the SM value is not calculated
     
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    • General topics for discussion are:
      • The interplay between the various Rare Decays measurements and measurements of CPV in the B and Charm system.
     
    • What does the excess in B->tau nu tell us about BR Bsmumu and other rare decays?
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      • Measurements with tau decays (this is an area that LHCb is not yet heavily pursuing).

    • Bs -> mu mu:
      • Given the current limits on Bs --> mu mu, what are the prospects on Bs --> tau tau, D0 --> mu mu , and related channels in MFV and non-MFV models?
      • SM calculation of BR(Bs-->mumu): Summarize SM calculation with the different approaches used. Is there a preferred calculation? Suggest a values and publication as SM reference.

    • b --> s l+ l-
      • What are the prospects for measurements of Bd --> K* tau tau? Are new observables accessible with tau reconstruction (helicity of the lepton)?
      • Assuming Bd -> K* mu mu is SM like, what are the prospects with Bs --> phi mu mu and Lambda_b --> lambda mu mu? Can there be large deviations in b -->
    d mu+ mu- channels where SM is further suppressed?
  • Can you see large direct CP asymmetries in Bd --> K* mu mu? Are there constraints from non-rare decays that limit the size of the CP violation?
  • Is a large, Babar-like, Isospin asymmetry possible in any class of NP models (whilst remaining consistent with A_I( K* gamma))?
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    • In which model/scenario we might have a LFV decay of tau->mu gamma or tau-->
    3 mu with a BR in the 10-9-10-10 range now that MEG put an upper limit on mu->e gamma at 2.4x10-12 ?
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    • Radiative decays:
      • What are the constraints from b -> d gamma decays? And what can learn from b->d gamma? Do we gain by measuring these suppressed modes versus measurements of b -> s gamma?
     
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    • LFV
      • Given existing results on mu -> e gamma and mu -> 3 e, what are the prospects for tau -> 3 mu?
      • What are the most promising decays to search for lepton flavour violation that can be measured in LHCb (which could include final states with electrons, muons, taus or charged hadrons, e.g. B -> e mu)?
      • What are the correlations with other non-lepton flavour violating observables (e.g. Bs -> mu mu)?
     
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    -- ThomasBlake - 10-Oct-2011
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    -- ThomasBlake - 10-Oct-2011

    Revision 22011-10-27 - JohannesAlbrecht

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    META TOPICPARENT name="LHCbNovember2011TheoryWorkshop"

    Session on LFV and rare D and B decays

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    LFV searches (30 min) Review of LFV tau decays after MEG. What are the correlations between charged and photon modes? What are the correlations between LFV tau decays and searches for non-LFV B and D decays.  
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    List of questions:
    

    • SM calculation of BR(Bs-->
    mumu): Summarize hte SM calculation with the different approaches. Is there a preferred calculation and where is it published?
    ex1
    A. Buras et al, arXiv:1007.5291: BR=(3.2+-0.2) x 10-9 and ex2: M. Bona et al. (UTFit Coll): BR= (3.7+-0.5)x10-9 Phys.Lett.B687 (2010) 61. at least in 1), the SM value is not calculated

    • What does the excess in B->tau nu tell us about BR Bsmumu and other rare decays?

    • In which model/scenario we might have a LFV decay of tau->mu gamma or tau--> 3 mu with a BR in the 10-9-10-10 range now that MEG put an upper limit on mu->e gamma at 2.4x10-12 ?

      -- ThomasBlake - 10-Oct-2011

    Revision 12011-10-10 - ThomasBlake

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    META TOPICPARENT name="LHCbNovember2011TheoryWorkshop"

    Session on LFV and rare D and B decays

    This twiki page documents the discussion of LFV and rare B and D decays for the LHCb-Theory workshop in November 2011.

    Session organisation

    A preliminary agenda for the session is:

    Talk Description Speaker
    Introduction (5 min) Brief introduction of the session  
    Interplay between direct and indirect searches (30 min ) Summary of interplay between direct and indirect search results, including results from global fits  
    Constraints on Wilson coefficients from global fits (20 min) Overview of the constraints on C7, C9, C10 coming from global fits of radiative Bd decays and Bd -> K* mu mu. What measurements can we include to improve sensitivity to NP.  
    LHCb summary: Prospects for Bd -> K* mu mu, Bd -> K* gamma and related channels (20 min) Overview of LHCb prospects for Winter conferences and 2012  
    Observables in b -> s (d) mu mu and b -> s (d) gamma decays (20 min) What new observables can we add? What do large Isospin asymmetries tell us about NP? CP violation in rare decays?  
    Coffee and discussion (30 min)  
    LHCb summary: reach in rare decay searches (20 min) Summary of LHCb's sensitivity in rare decay searches for Winter conferences and 2012  
    Searches with non-LFV channels (30 min) Prospects for D0 -> mu mu, Bs(d) -> mu mu (and tau tau). Correlations between rare decay searches and mixing in B and Charm  
    LFV searches (30 min) Review of LFV tau decays after MEG. What are the correlations between charged and photon modes? What are the correlations between LFV tau decays and searches for non-LFV B and D decays.  

    -- ThomasBlake - 10-Oct-2011

     
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